WASHINGTON — A study conducted by the University of Massachusetts Amherst and the University of Washington finds that college students are less concerned with driving while high on marijuana than driving while intoxicated.

Some 315 college freshmen were asked whether they’ve used marijuana and driven a vehicle in the past month, and how many of them have been in a vehicle with someone who’s used marijuana.

Boston Globe health blogger Deborah Kotz says about half the male students, and more than a third of female students have ridden in a vehicle with someone who was high.

Still, there’s no effective sobriety test for motorists high on marijuana. According to the study, more college students have been driven by someone high on marijuana than by someone who’s been drinking.

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